[1] Yonsei Univ, Dept Internal Med, Coll Med, 50-1 Yonsei Ro, Seoul 03722, South Korea
[2] Soonchunhyang Univ, Dept Internal Med, Coll Med, Bucheon, South Korea
[3] Kyungpook Natl Univ, Dept Internal Med, Sch Med, Daegu, South Korea
[4] Korea Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[5] Keimyung Univ, Dept Internal Med, Coll Med, Daegu, South Korea
[6] Yonsei Univ, Dept Internal Med, Wonju Coll Med, Wonju, South Korea
[7] Sungkyunkwan Univ, Kangbuk Samsung Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[8] Inha Univ, Dept Internal Med, Sch Med, Incheon, South Korea
[9] Pusan Natl Univ, Dept Internal Med, Coll Med, Busan, South Korea
[10] Ajou Univ, Dept Internal Med, Sch Med, Suwon, South Korea
[11] Konkuk Univ, Dept Internal Med, Sch Med, Seoul, South Korea
[12] Hanyang Univ, Dept Internal Med, Guri Hosp, Guri, South Korea
[13] Catholic Univ Korea, Dept Internal Med, Coll Med, Seoul, South Korea
[14] Catholic Univ Korea, Incheon St Marys Hosp, Dept Internal Med, Incheon, South Korea
[15] Hallym Univ, Dept Internal Med, Coll Med, Chunchon, South Korea
[16] Soonchunhyang Univ, Dept Internal Med, Coll Med, Seoul, South Korea
[17] Jungwon Univ, Dept Med Informat & Adm, Coll Hlth Sci, Goesan, South Korea